Memory loss

Memory loss is a partial or complete loss of memory caused by a physical or psychological condition. Memory loss can be temporary or permanent. Memory loss ranges from temporarily forgetting a simple fact to not knowing your own name. A variety of different factors cause memory changes. It is important to know the underlying cause of memory loss so that the proper treatment can be given.

Causes of memory loss:

Alzheimer's disease: It is the most common cause of dementia. Dementia is progressive and affects many brain functions, including memory.
Poor concentration
Depression: As well as poor concentration, some people with depression also have slowed thinking.
Physical illness: Certain illnesses can directly affect the way your brain works. For example, an underactive thyroid can slow down your body's functions, including your brain, and can make you more forgetful. Infections such as a chest infection or a urine infection can also cause sudden confusion and memory problems, particularly in older people.
Medicines: Certain medicines can cause confusion and memory problems in some people.
Age: As everyone gets older, it often becomes harder to remember things. This is called age-associated memory impairment.

When to see the doctor?

Often, memory loss that disrupts your life is one of the first or more recognizable signs of dementia. Other early signs might include:

Asking the same questions repeatedly
Forgetting common words when speaking
Mixing words up — saying "bed" instead of "table," for example
Taking longer to complete familiar tasks, such as following a recipe
Misplacing items in inappropriate places, such as putting a wallet in a kitchen drawer
Getting lost while walking or driving in a familiar area
Having changes in mood or behavior for no apparent reason

https://patient.info/brain-nerves/memory-loss-and-dementia/alzheimers-disease

https://www.healthline.com/health/memory-change#Causes

https://www.mayoclinic.org/diseases-conditions/alzheimers-disease/in-depth/memory-loss/art-20046326